Fatigue sans cause organique.
ETYM New Lat. asthenia, Greek asthenia; a priv. + sqenos strength.
Debility. An abnormal loss of strength; SYN. astheny.
ETYM Latin debilitas, from debilis weak, prob. from de- + habilis able: cf. French débilité. Related to Able.
Weakness.
The state of being weak; weakness; feebleness; languor.